JP2915568B2 - テープドライブシステムのための適応データ圧縮装置 - Google Patents

テープドライブシステムのための適応データ圧縮装置

Info

Publication number
JP2915568B2
JP2915568B2 JP2503756A JP50375690A JP2915568B2 JP 2915568 B2 JP2915568 B2 JP 2915568B2 JP 2503756 A JP2503756 A JP 2503756A JP 50375690 A JP50375690 A JP 50375690A JP 2915568 B2 JP2915568 B2 JP 2915568B2
Authority
JP
Japan
Prior art keywords
data
byte
segment
compression
reference value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP2503756A
Other languages
English (en)
Japanese (ja)
Other versions
JPH04503421A (ja
Inventor
ティモシー オブライエン，ジョン
レスリー トーマス，ネイル
デリース ダイアー，トレイシー
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SUTOREIJI TEKUNOROJII CORP
Original Assignee
SUTOREIJI TEKUNOROJII CORP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SUTOREIJI TEKUNOROJII CORP filed Critical SUTOREIJI TEKUNOROJII CORP
Publication of JPH04503421A publication Critical patent/JPH04503421A/ja
Application granted granted Critical
Publication of JP2915568B2 publication Critical patent/JP2915568B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/09—Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
    • H03M13/091—Parallel or block-wise CRC computation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1833—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/46—Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind
    • H03M7/48—Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind alternating with other codes during the code conversion process, e.g. run-length coding being performed only as long as sufficientlylong runs of digits of the same kind are present

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
JP2503756A 1989-02-09 1990-02-08 テープドライブシステムのための適応データ圧縮装置 Expired - Lifetime JP2915568B2 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/308,767 US4929946A (en) 1989-02-09 1989-02-09 Adaptive data compression apparatus including run length encoding for a tape drive system
US308,767 1989-02-09

Publications (2)

Publication Number Publication Date
JPH04503421A JPH04503421A (ja) 1992-06-18
JP2915568B2 true JP2915568B2 (ja) 1999-07-05

Family

ID=23195314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2503756A Expired - Lifetime JP2915568B2 (ja) 1989-02-09 1990-02-08 テープドライブシステムのための適応データ圧縮装置

Country Status (5)

Country Link
US (1) US4929946A (fr)
EP (1) EP0457840B1 (fr)
JP (1) JP2915568B2 (fr)
DE (1) DE69023329T2 (fr)
WO (1) WO1990009705A1 (fr)

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Also Published As

Publication number Publication date
WO1990009705A1 (fr) 1990-08-23
DE69023329D1 (de) 1995-12-07
EP0457840A1 (fr) 1991-11-27
EP0457840B1 (fr) 1995-11-02
DE69023329T2 (de) 1996-05-15
US4929946A (en) 1990-05-29
EP0457840A4 (en) 1992-10-21
JPH04503421A (ja) 1992-06-18

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